The Territories of Westeros

In [1]:

import geopandas as gp
from plotnine import (
    ggplot,
    aes,
    geom_map,
    geom_text,
    labs,
    scale_fill_brewer,
    scale_x_continuous,
    scale_y_continuous,
    scale_size_continuous,
    coord_cartesian,
    element_rect,
    theme_void,
    theme,
)

Layering different features on a Map

Read data and select features in Westeros only.

In [2]:

continents = gp.read_file("data/lands-of-ice-and-fire/continents.shp")
islands = gp.read_file("data/lands-of-ice-and-fire/islands.shp")
lakes = gp.read_file("data/lands-of-ice-and-fire/lakes.shp")
rivers = gp.read_file("data/lands-of-ice-and-fire/rivers.shp")
political = gp.read_file("data/lands-of-ice-and-fire/political.shp")
wall = gp.read_file("data/lands-of-ice-and-fire/wall.shp")
roads = gp.read_file("data/lands-of-ice-and-fire/roads.shp")
locations = gp.read_file("data/lands-of-ice-and-fire/locations.shp")

westeros = continents.query('name=="Westeros"')
islands = islands.query('continent=="Westeros" and name!="Summer Islands"')
lakes = lakes.query('continent=="Westeros"')
rivers = rivers.query('continent=="Westeros"')
roads = roads.query('continent=="Westeros"')

wg = westeros.geometry[0]
bool_idx = [wg.contains(g) for g in locations.geometry]
westeros_locations = locations[bool_idx]
cities = westeros_locations[westeros_locations["type"] == "City"].copy()

Create map by placing the features in layers in an order that limits obstraction.

The GeoDataFrame.geometry.centroid property has the center coordinates of polygons, we use these to place the labels of the political regions.

In [3]:

# Gallery, maps

# colors
water_color = "#a3ccff"
wall_color = "white"
road_color = "brown"


# Create label text by merging the territory name and
# the claimant to the territory
def fmt_labels(names, claimants):
    labels = []
    for name, claimant in zip(names, claimants):
        if name:
            labels.append("{} ({})".format(name, claimant))
        else:
            labels.append("({})".format(claimant))
    return labels


def calculate_center(df):
    """
    Calculate the centre of a geometry

    This method first converts to a planar crs, gets the centroid
    then converts back to the original crs. This gives a more
    accurate
    """
    original_crs = df.crs
    planar_crs = "EPSG:3857"
    return df["geometry"].to_crs(planar_crs).centroid.to_crs(original_crs)


political["center"] = calculate_center(political)
cities["center"] = calculate_center(cities)

(
    ggplot()
    + geom_map(westeros, fill=None)
    + geom_map(islands, fill=None)
    + geom_map(political, aes(fill="ClaimedBy"), color=None, show_legend=False)
    + geom_map(wall, color=wall_color, size=2)
    + geom_map(lakes, fill=water_color, color=None)
    + geom_map(rivers, aes(size="size"), color=water_color, show_legend=False)
    + geom_map(roads, aes(size="size"), color=road_color, alpha=0.5, show_legend=False)
    + geom_map(cities, size=1)
    + geom_text(
        political,
        aes("center.x", "center.y", label="fmt_labels(name, ClaimedBy)"),
        size=8,
        fontweight="bold",
    )
    + geom_text(
        cities,
        aes("center.x", "center.y", label="name"),
        size=8,
        ha="left",
        nudge_x=0.20,
    )
    + labs(title="The Political Territories of Westeros")
    + scale_fill_brewer(type="qual", palette=8)
    + scale_x_continuous(expand=(0, 0, 0, 1))
    + scale_y_continuous(expand=(0, 1, 0, 0))
    + scale_size_continuous(range=(0.4, 1))
    + coord_cartesian()
    + theme_void()
    + theme(figure_size=(8, 12), panel_background=element_rect(fill=water_color))
)

Credit: cadaei of the cartographersguild website forum.